2006. California Invasive Plant Inventory - Cal-IPC

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TABLE 1: Invasive Non-Native Plants that Threaten Wildlands in California (continued) Scientific Name Common Name Rating Ecological Types Invaded and Other Comments Regions Invaded Alert ◆ Impacts Invasiveness Distribution Doc. Level Medicago polymorpha California burclover Limited C C A 2.8 Grasslands. Widespread weed of agriculture and disturbed areas. Impacts in wildlands minor. CA-FP Mentha pulegium pennyroyal Moderate C A A 2.7 Vernal pools, wetlands. Poisonous to livestock. Spreading rapidly. Impacts largely unknown. ◆ Mesembryanthemum crystallinum crystalline iceplant Moderate B B C 3.7 Coastal bluffs, dunes, scrubs, grasslands. Limited distribution. Locally problematic, especially in southern CA. Myoporum laetum myoporum Moderate B B B 2.6 Coastal habitats, riparian areas. Mostly along the southern coast. Abiotic impacts unknown. CW, GV, NW, SW CW, NW, SW CW, SW Myosotis latifolia common forget-me-not Limited C B B 2.2 Coniferous forest, riparian. Little information on impacts. CA-FP ◆ Myriophyllum aquaticum parrotfeather High A B C 2.8 Freshwater aquatic systems NW, CaR, CW, SW Myriophyllum spicatum Eurasian watermilfoil High A A B 2.8 Freshwater aquatic systems SN, GV, CW Nicotiana glauca tree tobacco Moderate B B B 2.5 Coastal scrub, grasslands, riparian woodland. Abiotic impacts unknown. Impacts vary locally. Rarely in dense stands. NW, SN, GV, SW, D Olea europaea olive Limited C B B 2.5 A problem in Australia. Rarely escapes in CA but is a concern due to the possibility of spread from planted groves. CW, GV, NW, SW Ononis alopecuroides foxtail restharrow Limited C B C 2.2 Grasslands, oak woodland. Highly invasive but impacts unknown. Nearly eradicated. CW Onopordum acanthium Scotch thistle High A B B 2.9 Wet meadows, sage brush, riparian areas CA-FP, MP Oxalis pes-caprae buttercup oxalis, Bermuda buttercup, yellow oxalis Moderate B B B 2.9 Coastal dunes, scrub, oak woodland. Impacts in coastal areas may prove more severe in time. CW, NW, SW Parentucellia viscosa yellow glandweed, sticky parentucellia Limited C B B 2.5 Coastal prairie, grassland, and dunes. Impacts unknown, but can be locally significant. NW, CaR, SN, CW, SW Pennisetum clandestinum kikuyugrass Limited C C B 2.3 Present at low levels in numerous wildland habitats. Impacts unknown. Common turf weed. NW, CW, SW Scientific names based on The Jepson Manual. For each species, the first common name is based on the Weed Science Society of America’s “Composite List of Weeds” (www.wssa. net), followed by other names used in California. Scores: A = Severe, B = Moderate, C = Limited, D = None, U = Unknown. Documentation level averaged. Regions invaded based on Jepson geographic regions. Plant assessment forms, literature citations, and full rating criteria available at www.cal-ipc.org. CALIFORNIA INVASIVE PLANT INVENTORY | 15
TABLE 1: Invasive Non-Native Plants that Threaten Wildlands in California (continued) Scientific Name Common Name Rating Ecological Types Invaded and Other Comments Regions Invaded Alert ◆ Impacts Invasiveness Distribution Doc. Level Pennisetum setaceum crimson fountaingrass Moderate B B B 2.9 Coastal dunes and scrub, chaparral, grasslands. Some horticultural cultivars sterile. Very invasive in Hawaii. Phalaris aquatica hardinggrass Moderate B B B 2.6 Coastal sites, especially moist soils. Limited distribution. Can be highly invasive locally. Phoenix canariensis Canary Island date palm Limited C B D 2.3 Desert washes; agricultural crop plant. Limited distribution in southern CA. Impacts can be higher locally. CW, NW, SN, SW CW, NW, SN, SW CW, SW Picris echioides bristly oxtongue Limited C B B 2.4 Coastal prairie, scrub, riparian woodland. Widespread locally. Abiotic impacts unknown. Piptatherum miliaceum smilograss Limited C B B 2.4 Coastal dunes, scrub, riparian, grassland. Expanding range. Impacts largely unknown. CA-FP GV, CW, SW Plantago lanceolata buckhorn plantain, English plantain Poa pratensis Kentucky bluegrass ◆ Polygonum cuspidatum (=Fallopia japonica) Japanese knotweed Limited C C B 2.1 Many habitats. Turf weed primarily. Low density and impact in wildlands. Limited C B B 2.7 Grasslands scrub, riparian areas. Widespread turf plant. Abiotic impacts unknown. Moderate B B D 2.7 Riparian areas, wetlands, forest edges. More severe impacts in NW wetlands. Distribution limited in CA. ◆ Polygonum sachalinense Sakhalin knotweed Moderate B A D 2.5 Riparian areas. More severe impacts in NW wetlands. Distribution limited in CA. Polypogon monspeliensis and subspp. rabbitfoot polypogon, rabbitgoot grass Potamogeton crispus curlyleaf pondweed Prunus cerasifera cherry plum, wild plum Pyracantha angustifolia, P. crenulata, P. coccinea pyracantha, firethorn Limited C C B 2.3 Margins of ponds and streams, seasonally wet places, edge of coastal dunes. Widespread. Impacts appear to be minor. CA-FP CA NW, CaR, SN, GV, CW NW, CaR, SN, GV, CW Moderate B B B 3.2 Freshwater aquatic systems. Can be very invasive locally. NW, GV, CW, SW, DMoj Limited C B B 1.8 Riparian habitats, chaparral, woodland. Limited distribution. Abiotic impacts unknown. Limited C B B 2.8 Coastal scrub and prairie, riparian areas. Horticultural escape. Impacts unknown or minor. Ranunculus repens creeping buttercup Limited C C B 2.9 Riparian areas, coniferous forest. Impacts appear to be minor to negligible in most areas. Raphanus sativus radish Limited C C B 2.5 Present at low levels in numerous habitats. Widespread in disturbed sites. CA NW, CW NW, CW, SW NW, CaR, SN, CW, SW Scientific names based on The Jepson Manual. For each species, the first common name is based on the Weed Science Society of America’s “Composite List of Weeds” (www.wssa. net), followed by other names used in California. Scores: A = Severe, B = Moderate, C = Limited, D = None, U = Unknown. Documentation level averaged. Regions invaded based on Jepson geographic regions. Plant assessment forms, literature citations, and full rating criteria available at www.cal-ipc.org. CA-FP 16 | CALIFORNIA INVASIVE PLANT INVENTORY
Page 1 and 2: California Invasive Plant Council P
Page 3 and 4: INVENTORY REVIEW COMMITTEE Dr. Carl
Page 6 and 7: Introduction Invasive plants damage
Page 8 and 9: edu) so that ratings could be appli
Page 10 and 11: inventory does not attempt to sugge
Page 12 and 13: TABLE 1: Invasive Non-Native Plants
Page 26 and 27: TABLE 3: Species Evaluated But Not
Page 28 and 29: TABLE 4: Species Nominated but Not
Page 30 and 31: APPENDIX 1: Species Listed by Categ
Page 32 and 33: APPENDIX 2. Cal-IPC Species Listed
Page 34 and 35: APPENDIX 2: Cal-IPC Species Listed
Page 36 and 37: APPENDIX 2: Cal-IPC Species Listed
Page 38 and 39: APPENDIX 3. Examples of Ecological
Page 40 and 41: APPENDIX 4. Species by Common Name
Page 42 and 43: APPENDIX 4: Species by Common Name
Page 44: California Invasive Plant Council 2

2006. California Invasive Plant Inventory - Cal-IPC

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